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解題如下: 1÷2×(7+15+6)x=20 兩邊同乘以2得,(7+15+6)x=40 括弧裡面算出來得,28x=40 兩邊同除以28得,x=10/7
6(x+0.3)=9.6 x+0.3=1.6 x=1.3
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